[issue10049] Add a "no-op" (null) context manager to contextlib

[Hrvoje Nikšić]

Hrvoje Nikšić <hniksic at gmail.com> added the comment:

I considered using a variable, but I went with the factory function for two reasons: consistency with the rest of contextlib, and equivalence to the contextmanager-based implementation.

Another reason is that it leaves the option of adding optional parameters at a later point.  I know, optional parameters aren't likely for a "null" constructor, but still... it somehow didn't feel right to relinquish control.

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<http://bugs.python.org/issue10049>
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